Book 3 is a collection of mental exercises - open-ended problems that will stretch your sense of 3-dimensional thinking and encourage creative problem-solving.
This book will make a more imaginative and creative Cuboro builder out of even the most involved fan. The challenges it poses will give you a new way to think about Cuboro and marble runs. Great for play, Montessori educators and homeschoolers.
Dimensions: 24cm x 22cm x 3cm